Senior Backend Software Engineer, AI Observability & Evals Platform; LangSmith

Design, build, and maintain backend services and APIs for Lang Smith's tracing, monitoring, and evaluation workflows, while improving performance and reliability for high-volume data. Troubleshoot production issues, document systems, and collaborate with engineering, product, and design teams to deliver features.

Candidates need 4+ years of backend engineering experience with complex products, proficiency in a backend language such as Python or Go, and strong API and reliable data-service design skills. Experience with mission-critical systems, performance and reliability optimization, and cross-functional communication is expected; database and cloud-platform experience is a bonus.

Backend Engineering, Python, Go, API Design, Backend Services, Data Services, High-Throughput Systems, Performance Optimization, Reliability Engineering, PostgreSQL, Redis, Click House, Cloud Platforms, Production Troubleshooting, Root-Cause Analysis, Cross-Functional Collaboration

• Medical Coverage
• Dental Coverage
• Vision Coverage
• Flexible Vacation
• 401(k) Plan
• Meals On In-Office Days
• Equity